In my experience with being ahead, I had to move school districts a couple times to avoid administrative resistance. It goes ok, then you get the teacher that doesn’t want you to be ahead of her son and then proceeds to teach you stuff that she already taught you a couple years before.

My parents also had plenty of free time and money which helps with the process.

To be honest, I think that the school was going through a very tough time itself.

Around that time they had an award they had previously won for being 'exceptional in physics' actually stripped from them and the country's ratings board reduced their rating.

While I don't know exactly the official reasons that those things were done, I do know that the quality of teaching in many subjects was very bad, not just for me. For example, in physics, we often had to lie to write up experiments we had not done, because there was neither equipment or time to run the experiments we were supposed to for the curriculum.

The year after this, the teacher told us that the exam board had started to get suspicious, and had demanded we include photographs of ourselves performing the experiments. So we had to mock up as best we could the experiment test setup with what broken or substituted equipment we had.